AT+CCHO=<dfname>
Execution command causes the MT to return <sessionId> to allow the TE
to identify a channel that is being allocated by the currently selected UICC,
which is attached to ME. The currently selected UICC will open a new
logical channel, select the application identified by the <dfname> received
with this command and return a <sessionId> as the response. The ME
shall restrict the communication between the TE and the UICC to this
logical channel.
The response message of the command is in the format:
+CCHO: <sessionId>
The <sessionId> is described in the Additional info section.
Error case:
+CME ERROR: <err>
Parameter: